From: Jan Kiszka <jan.kiszka@web.de>
To: Avi Kivity <avi@redhat.com>
Cc: Anthony Liguori <aliguori@us.ibm.com>,
kvm@vger.kernel.org, "Michael S. Tsirkin" <mst@redhat.com>,
Marcelo Tosatti <mtosatti@redhat.com>,
qemu-devel <qemu-devel@nongnu.org>,
Blue Swirl <blauwirbel@gmail.com>
Subject: Re: [RFC][PATCH 14/16] kvm: x86: Add user space part for in-kernel i8259
Date: Mon, 05 Dec 2011 12:37:37 +0100 [thread overview]
Message-ID: <4EDCAD01.2010608@web.de> (raw)
In-Reply-To: <4EDC9680.2070305@redhat.com>
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On 2011-12-05 11:01, Avi Kivity wrote:
> On 12/04/2011 11:38 PM, Jan Kiszka wrote:
>>>
>>> It should be also possible to migrate from non-KVM device to KVM
>>> version, different names would prevent that for ever.
>>
>> It is (theoretically) possible with these patches as the vmstate names
>> are the same. KVM to TCG migration does not work right now, so I was
>> only able to test in-kernel <-> user space irqchip model migrations.
>
> btw, for the next-gen migration protocol, we'd probably be using QOM
> paths, not vmstate names; the QOM paths would include the device name?
That would be a very bad idea IMHO. Every refactoring of your device
tree, e.g. to model CPU hotplug and the ICC bus more accurately, would
risk to create a migration crack. At least we would need some stable
naming and/or alias concept then.
Jan
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WARNING: multiple messages have this Message-ID (diff)
From: Jan Kiszka <jan.kiszka@web.de>
To: Avi Kivity <avi@redhat.com>
Cc: Anthony Liguori <aliguori@us.ibm.com>,
kvm@vger.kernel.org, "Michael S. Tsirkin" <mst@redhat.com>,
Marcelo Tosatti <mtosatti@redhat.com>,
qemu-devel <qemu-devel@nongnu.org>,
Blue Swirl <blauwirbel@gmail.com>
Subject: Re: [Qemu-devel] [RFC][PATCH 14/16] kvm: x86: Add user space part for in-kernel i8259
Date: Mon, 05 Dec 2011 12:37:37 +0100 [thread overview]
Message-ID: <4EDCAD01.2010608@web.de> (raw)
In-Reply-To: <4EDC9680.2070305@redhat.com>
[-- Attachment #1: Type: text/plain, Size: 852 bytes --]
On 2011-12-05 11:01, Avi Kivity wrote:
> On 12/04/2011 11:38 PM, Jan Kiszka wrote:
>>>
>>> It should be also possible to migrate from non-KVM device to KVM
>>> version, different names would prevent that for ever.
>>
>> It is (theoretically) possible with these patches as the vmstate names
>> are the same. KVM to TCG migration does not work right now, so I was
>> only able to test in-kernel <-> user space irqchip model migrations.
>
> btw, for the next-gen migration protocol, we'd probably be using QOM
> paths, not vmstate names; the QOM paths would include the device name?
That would be a very bad idea IMHO. Every refactoring of your device
tree, e.g. to model CPU hotplug and the ICC bus more accurately, would
risk to create a migration crack. At least we would need some stable
naming and/or alias concept then.
Jan
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next prev parent reply other threads:[~2011-12-05 11:37 UTC|newest]
Thread overview: 107+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-03 11:17 [RFC][PATCH 00/16] uq/master: Introduce basic irqchip support Jan Kiszka
2011-12-03 11:17 ` [Qemu-devel] " Jan Kiszka
2011-12-03 11:17 ` [RFC][PATCH 01/16] msi: Generalize msix_supported to msi_supported Jan Kiszka
2011-12-03 11:17 ` [Qemu-devel] " Jan Kiszka
2011-12-04 10:42 ` Michael S. Tsirkin
2011-12-04 10:42 ` [Qemu-devel] " Michael S. Tsirkin
2011-12-04 10:42 ` Jan Kiszka
2011-12-04 10:42 ` [Qemu-devel] " Jan Kiszka
2011-12-04 13:12 ` Avi Kivity
2011-12-04 13:12 ` [Qemu-devel] " Avi Kivity
2011-12-04 13:16 ` Jan Kiszka
2011-12-04 13:16 ` [Qemu-devel] " Jan Kiszka
2011-12-04 13:26 ` Avi Kivity
2011-12-04 13:26 ` [Qemu-devel] " Avi Kivity
2011-12-03 11:17 ` [RFC][PATCH 02/16] kvm: Move kvmclock into hw/kvm folder Jan Kiszka
2011-12-03 11:17 ` [Qemu-devel] " Jan Kiszka
2011-12-03 19:00 ` Andreas Färber
2011-12-03 19:00 ` Andreas Färber
2011-12-03 22:33 ` Jan Kiszka
2011-12-03 22:33 ` [Qemu-devel] " Jan Kiszka
2011-12-04 10:43 ` Avi Kivity
2011-12-04 10:43 ` Avi Kivity
2011-12-04 10:46 ` Jan Kiszka
2011-12-04 10:46 ` Jan Kiszka
2011-12-05 10:43 ` Andreas Färber
2011-12-03 11:17 ` [RFC][PATCH 03/16] apic: Stop timer on reset Jan Kiszka
2011-12-03 11:17 ` [Qemu-devel] " Jan Kiszka
2011-12-03 11:17 ` [RFC][PATCH 04/16] apic: Factor out core for KVM reuse Jan Kiszka
2011-12-03 11:17 ` [Qemu-devel] " Jan Kiszka
2011-12-03 11:17 ` [RFC][PATCH 05/16] apic: Open-code timer save/restore Jan Kiszka
2011-12-03 11:17 ` [Qemu-devel] " Jan Kiszka
2011-12-03 11:17 ` [RFC][PATCH 06/16] i8259: Factor out core for KVM reuse Jan Kiszka
2011-12-03 11:17 ` [Qemu-devel] " Jan Kiszka
2011-12-03 11:17 ` [RFC][PATCH 07/16] ioapic: Convert to memory API Jan Kiszka
2011-12-03 11:17 ` [Qemu-devel] " Jan Kiszka
2011-12-03 11:17 ` [RFC][PATCH 08/16] ioapic: Reject non-dword accesses to IOWIN register Jan Kiszka
2011-12-03 11:17 ` [Qemu-devel] " Jan Kiszka
2011-12-03 11:17 ` [RFC][PATCH 09/16] ioapic: Factor out core for KVM reuse Jan Kiszka
2011-12-03 11:17 ` [Qemu-devel] " Jan Kiszka
2011-12-03 11:17 ` [RFC][PATCH 10/16] memory: Introduce memory_region_init_reservation Jan Kiszka
2011-12-03 11:17 ` [Qemu-devel] " Jan Kiszka
2011-12-04 13:20 ` Avi Kivity
2011-12-04 13:20 ` [Qemu-devel] " Avi Kivity
2011-12-04 13:24 ` Jan Kiszka
2011-12-04 13:24 ` [Qemu-devel] " Jan Kiszka
2011-12-03 11:17 ` [RFC][PATCH 11/16] kvm: Introduce core services for in-kernel irqchip support Jan Kiszka
2011-12-03 11:17 ` [Qemu-devel] " Jan Kiszka
2011-12-04 13:23 ` Avi Kivity
2011-12-04 13:23 ` [Qemu-devel] " Avi Kivity
2011-12-04 13:27 ` Jan Kiszka
2011-12-04 13:27 ` [Qemu-devel] " Jan Kiszka
2011-12-04 13:28 ` Avi Kivity
2011-12-04 13:28 ` [Qemu-devel] " Avi Kivity
2011-12-04 13:30 ` Jan Kiszka
2011-12-04 13:30 ` [Qemu-devel] " Jan Kiszka
2011-12-04 13:32 ` Avi Kivity
2011-12-04 13:32 ` [Qemu-devel] " Avi Kivity
2011-12-03 11:17 ` [RFC][PATCH 12/16] kvm: x86: Establish IRQ0 override control Jan Kiszka
2011-12-03 11:17 ` [Qemu-devel] " Jan Kiszka
2011-12-03 11:17 ` [RFC][PATCH 13/16] kvm: x86: Add user space part for in-kernel APIC Jan Kiszka
2011-12-03 11:17 ` [Qemu-devel] " Jan Kiszka
2011-12-04 13:24 ` Avi Kivity
2011-12-04 13:24 ` [Qemu-devel] " Avi Kivity
2011-12-03 11:17 ` [RFC][PATCH 14/16] kvm: x86: Add user space part for in-kernel i8259 Jan Kiszka
2011-12-03 11:17 ` [Qemu-devel] " Jan Kiszka
2011-12-04 13:31 ` Avi Kivity
2011-12-04 13:31 ` [Qemu-devel] " Avi Kivity
2011-12-04 13:42 ` Jan Kiszka
2011-12-04 13:42 ` [Qemu-devel] " Jan Kiszka
2011-12-04 13:49 ` Avi Kivity
2011-12-04 13:49 ` [Qemu-devel] " Avi Kivity
2011-12-04 13:51 ` Jan Kiszka
2011-12-04 13:51 ` [Qemu-devel] " Jan Kiszka
2011-12-04 14:04 ` Avi Kivity
2011-12-04 14:04 ` [Qemu-devel] " Avi Kivity
2011-12-04 14:06 ` Jan Kiszka
2011-12-04 14:06 ` [Qemu-devel] " Jan Kiszka
2011-12-04 15:12 ` Avi Kivity
2011-12-04 15:12 ` [Qemu-devel] " Avi Kivity
2011-12-04 15:19 ` Jan Kiszka
2011-12-04 15:19 ` [Qemu-devel] " Jan Kiszka
2011-12-04 16:35 ` Avi Kivity
2011-12-04 16:35 ` [Qemu-devel] " Avi Kivity
2011-12-04 21:31 ` Blue Swirl
2011-12-04 21:31 ` [Qemu-devel] " Blue Swirl
2011-12-04 21:38 ` Jan Kiszka
2011-12-04 21:38 ` [Qemu-devel] " Jan Kiszka
2011-12-05 10:01 ` Avi Kivity
2011-12-05 10:01 ` [Qemu-devel] " Avi Kivity
2011-12-05 11:37 ` Jan Kiszka [this message]
2011-12-05 11:37 ` Jan Kiszka
2011-12-05 12:36 ` Avi Kivity
2011-12-05 12:36 ` [Qemu-devel] " Avi Kivity
2011-12-05 12:47 ` Jan Kiszka
2011-12-05 12:47 ` [Qemu-devel] " Jan Kiszka
2011-12-05 13:14 ` Avi Kivity
2011-12-05 13:14 ` [Qemu-devel] " Avi Kivity
2011-12-05 13:29 ` Jan Kiszka
2011-12-05 13:29 ` [Qemu-devel] " Jan Kiszka
2011-12-05 13:36 ` Avi Kivity
2011-12-05 13:36 ` [Qemu-devel] " Avi Kivity
2011-12-05 13:55 ` Jan Kiszka
2011-12-05 13:55 ` [Qemu-devel] " Jan Kiszka
2011-12-03 11:17 ` [RFC][PATCH 15/16] kvm: x86: Add user space part for in-kernel IOAPIC Jan Kiszka
2011-12-03 11:17 ` [Qemu-devel] " Jan Kiszka
2011-12-03 11:17 ` [RFC][PATCH 16/16] kvm: Arm in-kernel irqchip support Jan Kiszka
2011-12-03 11:17 ` [Qemu-devel] " Jan Kiszka
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